.
Thread 4 (process 6123):
#0  0xffffe405 in __kernel_vsyscall ()
#1  0xf795af15 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib32/libpthread.so.0
#2  0xf6c8bff8 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#3  0xf6d86438 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#4  0xf6c8c34d in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#5  0xf79564fb in start_thread () from /lib32/libpthread.so.0
#6  0xf78d008e in clone () from /lib32/libc.so.6
.
Thread 3 (process 6124):
#0  0xffffe405 in __kernel_vsyscall ()
#1  0xf795af15 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib32/libpthread.so.0
#2  0xf6c8bff8 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#3  0xf6d86438 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#4  0xf6c8c34d in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#5  0xf79564fb in start_thread () from /lib32/libpthread.so.0
#6  0xf78d008e in clone () from /lib32/libc.so.6
.
Thread 2 (process 6125):
#0  0xffffe405 in __kernel_vsyscall ()
#1  0xf795d175 in sem_wait@@GLIBC_2.1 () from /lib32/libpthread.so.0
#2  0xf6c961a8 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#3  0xf79564fb in start_thread () from /lib32/libpthread.so.0
#4  0xf78d008e in clone () from /lib32/libc.so.6
.
Thread 1 (process 6110):
#0  0xf7958540 in pthread_mutex_lock () from /lib32/libpthread.so.0
#1  0xf6d84168 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#2  0xf5b65024 in ?? ()
#3  0xf72d7de8 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#4  0xffb7b5d8 in ?? ()
#5  0xf72d7de8 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#6  0xf73184a0 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
#7  0x0000003d in ?? ()
#8  0xffb7b608 in ?? ()
#9  0xf6ddb582 in ?? () from /usr/lib/flashplugin-nonfree/libflashplayer.so
Backtrace stopped: previous frame identical to this frame (corrupt stack?)